Chapter 2 Taking Measurements
2.5 Measuring pH
18
HORIBA
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Standard solution calibration
Perform a one-point calibration for making simple pH measurements; for
more accurate measurements, perform at least a two-point calibration.
Up to three points can be used for calibration. If you perform calibration for a
fourth points, “ERR06 Calibration point error” is displayed.
Standard solutions for calibration are defaulted to pH 2, pH 4, pH 7, pH
9, and pH 12.
3.4.2 pH standard solution setting
This section will explain how to conduct a two-point calibration using pH
7 and pH 4 standard solutions.
Calibration procedure
1.
Press the CAL key while in the pH Measurement mode.
The meter enters the Calibration mode and >CAL< is displayed.
The mode cannot be changed during Auto Hold calibration (while “HOLD” is
blinking or continually displayed).
2.
Wash the tip of the electrode well with pure (de-ionized) water,
and then wipe with filter paper or tissue paper.
Displayed item differs
depending on the
standard solution setting.
